Rotary pump of variable flow.



M. BERTRAND & C. MENDIZABAL. ROTARY PUMP OFVARIABLB FLOW. :APPLIUATION FILED 11211.21, 1911.

1,051,306. Patented Jan. 21,1913.

5 SHBETS-SHEET 1.

70 g ai i 39 f p//m wm Y WPWMZ/ M. BERTRAND 6L G. MENDIZABAL.

ROTARY PUMP OP VARIABLE FLOW.

APPLICATION FILED APR. 27. 1911.

1,051,806. Patented Jan. 21, 1913.

5 SHEETS-SHEET z.

M. BERTRAND & G. MENDIZAB'AL.

ROTARY PUMP 0F VARIABLE FLOW.

APPLICATION FILED APB.. 27, 1911.

Patented J an. 21', 1913.

5 SHEETS-SHEET a.

M. BERTRAND 6r. C. MENDIZABAL.

ROTARY PUMP 0F VARIABLE PLOW.

AIPLIGATION FILED APR-27, 1911. 1,051,306, Patented 1111.21, 1913.

5 SHEETS-SHEET 4.

M. BERTRAND & C. MENDIZABAL.

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1,051,306. Patented Jan. 21, 1918.

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'UNITED STATES PATENT oErucE.N

MANUEL BERTRAND, OF BARCELONA, AND CARLOS MENDIZABAL. OF SARAGOSSA,

SPAIN.

ROTARY PUMP 0F VARIABLE FLOW.

Specification of Letters Patent.

Application led April 27, 1'911.

Patented Jan. 21, 1913.

Serial No. 623.793.

To all whom it may concern.'

Be it known that we, MANUEL BERTRAND useful Improvements in Rotary Pumps of Variable Flow; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will f. enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements 1n a rotary pump consist-ing in the combination of several cylinders rotarily mounted around a shaft within an annular distributer made of two sections, one of which is intended to supply the fluid corresponding to the suction of the pumps andthe other is intended to receive the fluid corresponding to the discharge. All the pistons are caused to move by the action of an eccentric of variable position relatively to the axis of rotation of the pump; and each cylinder is furnished with an opening which leads to the distributer.

This invention has for its object to vary the flow of the pump from zero to a positive maximum or to a negative maximum, by changing the position of the eccent-ric which moves the pistons, without changing the direction of the rotary motion. Thus, when t-he eccentric is in one position, all the suction takes Vplace through one of the pas? sages of the distributer and the discharge takes place throu h the other passage, and when the eccentric is in another position, a part of the suction and a part of the discharge will take place in the same conduit, which causes a diminution of the e'liiciency or a diminution of Vthe iow of the pump. Thus, not only the outflow of the pump may pass from a maximum .to zero, but the action may be reversed, namely the exhaust conduit may become the suction one, and viceversa. A single opening is sufficient to connect each cylinder with the distributer; but in t-he positions near to a null f1ow,'when the opening passes beyond the separator of the distributer conduits, the Stream is suddenly cut 0E and this may produce a Vstrong counter-pressure on the crank shaft. 'To avoid this inconvenience, each cylinder is provided with two openings and between them there is a separator wit-h a length at least equal to the separation of the sections of the distributer. Thus it will result that during the passage of one opening on the separation of the distributer, the other opening will remain free, and will give passage to the uid so that no excessive counterpressure can take place. There is, however, a moment at which an extra flow of fluid may take place from the exhaust conduit to the suction conduit across the cylinder. To prevent this fact, said openings are arranged n so as to communicate with the cylinder at different points, in order that one of said openings will be always free and the other closed when the piston reaches the dead points.

In the accompanying drawings we represent our improved rotary pump.

Figure 1 is a sectional view of the pump with four cylinders and only one passage for each cylinder; Figs. 2 and 4 are sectional views taken on line 4:1 of Fig. 3 which is a sectional View taken on line 3901'" Fig. 2, of a modfied form of pump; and Fig. 5 is a diagrammatical View of two pumps coupled together.

-The pump is composed of a `cylinder 1 revolubly mounted within` an annular distributer formed by two conduits 2, 4 septhrough openings 15 with the conduits 2, 4

of the distributer. The rods of said pistons 6, 7 8, 9 are caused to revolve about a shaft 33 eccentrically placed relatively to the shaft 29 of the revolving cylinder 1. The eccentric 33 is mounted on a shaft 30, that has fixed thereon a worm gear wheel 31 meshing with a screw gear 32. The eccentric 33 is adapted to be actuated by said screw and worm gear 31 and 32. The dead points of the pistons are always on the plane of the division line 39, which line 39 also passes through the center of the cylinder 1 and the center of the eccentric 33, said line 39'also to the passage' of the openings before the partitions 10, 11 of the distributer.

Fig. 2 represents a modification which consists in having in each cylinder two ports 13, 14 separated from each other by a part 12 equal to the distance between the chambers 2, 4 of the distributer, so that when said parts l2 ass before the partitions 10, 11 of the distri uter, one of them will remain always open and will not be .liable to produce a strong counterpressure which would injure the apparatus.

Fig. 4 represents another modified form of apparatus in which the ports 13,- 14, do not communicate directly with the bottom of the cylinder, as in Fig. 2, but they communicate with the channels and 36. at different points. The piston is also modified in that it elongates toward the bottom of the cylinder, to `form a tail-piece 37 to close the channel 36 of the port when the piston is at the inner dead point, as in piston 8, in this view, and the same channel 36 willbe closed by the piston when it is at the outer dead point, as in piston 6 of this View. The channel 35 of the port 13 is always free to communicate directly with the cylinder.

In the position of the pistons 7 and 9, their respective channels 36 are open and permit the cylinder to communicate with the corresponding annular conduits. According to the position of the pistons shown in Figs. 2

and 4, the effect of the pump is null, as the cylinders will suck durin a half stroke into one conduit and will disc arge into the same conduit during the other half stroke. Referring now to Fig. 1, if the cylinder 1 is caused to rotate with the shaft 29 in direction of the arrow'24, the shaft 33 and the' distributer 2, 4 remaining stationary the pis- Y tons will receive a reciprocating motion within said cylinders, and will suck in a charge when each cylinder travels in the channel 2 and will exhaust when the cylinder runs inthe channel 4. If now we place the plane 39 forming an angle with the plane 38, the flow ofthe pump will be lessened, Vas each piston will perform in the same conduit part of the suction' and part of the discharge, the eiect being just the difference between them. In Fig. 2, the plane 38 and the plane 39' form right les and consequently the pistons cause suctlon to take lace from the position of the iston 6 to t e position of thepiston 8, as s own by the arrows 26, 25; and cause the fluid to be discharged from the position of the iston 8 to the position of the piston 6, as s "own by the arrows 27, 28. Thus it will be seenthatfin each conduit one half of vthe suction and one half of the discharge take place, and thus the effect is null. When the angle which both planes are laced to one another exceeds 90 the flow will be reversed, or its direction changed accordingly, that is to say, that the suction conduit will become the exhaust one and viceversa'. When the uid to be sucked and discharged by the pump is not compressible, as are practically all the liquids, the diminution of the flow does not cause a loss of energy, as the fact that a part of the liquid contained in the cylinders, instead of being sent to 2 be restored to 4, does not involve a loss of working effect, as the latter4 develops only when the liquid is thrown against the pressure existing in 4. The working of the apparatus as described, takes place also in case the cylinders develop mo-re than f one cycle at each revolution of the body 1, but in this case the distributer must be furnished with so many pairs of conduits 2, 4, as cycles are developed by the cylinders at each revolution of 1.

It will be possible to couple two of these-l yangle formed by the planes 39, 40 (Fig. 5),

the fiow of the motive pump will be equal to the capacity of the receiving pump, both corresponding to elective arcs of 90 for the suction =and for the discharge. Under these circumstances the speed of the receiving pump is equal to that of the motive one. If, for instance, we change the positions vof the planes 39, 40, and in the receiving pump we increase the angle which is formed with the plane 38, this angle will decrease in the motive pump and the iiow of the latter will decrease accordingly, whereas the capacity of the receiving pump will be increased and the ratio of speeds will decrease for both reasons. If the planes 39, 40 turn in opposite directions, the motor flow will increase, the capacity of the receiver will decrease, and the ratio of speeds will increase foi-'the two reasons hereinbefore stated. In all cases, the relation will be indicated by afraction the numerator of which will be the ow per revolution of the generating pump, and the denominator will be the capacity of the receiving pump.

Having thus described our invention, we declare that what we claim and desire to secure by Letters Patent,'is:

1. In a ump of variable flow, the combination o? an annular distributer having an inlet and an outlet with a semi-circular conduit extending from each and constructed with opposed partitions separating said conduits, a vdisk rotatably mounted in the distributer and rovided with al lun rality of cylinders, pistons in the cylin ers,

the disk having ports adapted to establish communication between the cylinders and the conduits, an eccentric connected to the pistons, means for rotating the eccentric, and means for changing the position of the eccentric with relation to the axis of the disk, substantially as described.

2. In a pump of variable flow, the combination of an annular distributer having an inlet and an -outlet with a semi-circular conduit extending from each and constructed with a pair of opposed partitions an inlet and an outlet with a semi-circular' conduit extending from each and constructed with a pair of opposed partitions separating said conduits, a disk rotatably mounted in the distributer and provided with a plurality of cylinders, pistons in the cylinders having each a projecting slotted portion, the disk having ports leadmg from different points relative to the bottom of each cylinder and separated by a part equal to the partition between the conduits adapted to establish communication with the conduits on either side of said partitions, an eccentric connected to the pistons, means for rotating the eccentric, and means for chan ing the position of the eccentric relatlve to the axis of the disk, whereby the pistons will close one of the ports leading to each cylinder at different points and open both of the ports when at other oints of their strokes, substantially as described.

In testimony whereof, I affix my signature, in presence of witnesses.

MANUEL BERTRAND. Witnesses:

W. SrAims,

HARRY A. MoBRmE, CONSTANTINE LEEPER. In testimony whereof, I ax my signature in presence of two witnesses. Y

C. MENDIZABAIL. Witnesses:

JOAQUIN GoNoAs, NIooLs DE OoHvA. 

